Currently, there is no way to listen to both new best solution and solver terminated events; you can only do one or the other:

solverManager.solve(id, finalBestSolutionListener)
or
solverManager.solveAndListen(id, bestSolutionListener)

As such, it is hard to create a reactive publisher that let its consumers know both the latest solution and when the solver terminated (example: updating the UI of an application whenever the best solution is updated, but also show solver status in the UI).

Proposal A

solverManager.solveAndListen(
    ...,
    // For every new best solution event
    (bestSolution) -> send(bestSolution),
    // The solver terminated
    (bestSolution) -> end(),
    (exception) -> ...);

Proposal B

solverManager.solveAndListen(
    ...,
    // For every new best solution event
    (bestSolution) -> send(bestSolution),
    // The solver terminated
    () -> end(),
    (exception) -> ...);